linux-kernel - Re: perf segmentation fault from NULL dereference

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Date:   Wed, 26 Sep 2018 20:00:35 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     John Garry <john.garry@...wei.com>
Cc:     Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Linuxarm <linuxarm@...wei.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: perf segmentation fault from NULL dereference

> Please me let me know if a valid issue so we can get a fix in.

If it crashes it must be a valid issue of course.

But I'm not sure about your bisect. Hard to see how my patch
could cause this. Sometimes bisects go wrong. 
You verified by just reverting the patch?

First thing I would also try is to run with valgrind or ASan and see if it
reports anything.

-Andi